I would not put any kind of forced induction or nitrous on an engine with 130,000 on it. What I would do is start off by building up the bottom end. Get stronger rods and pistons. If you eventually want a s/c or turbo, drop the CR down to 9.0:1. Then down the road you can go FI and be set. If for now you want to do mods, buy things that will make sense fr when you Do get that s/c or turbo. Exhaust may seem pointles right now, but would be a must have if you go FI.

Also, there is NO point in doing a swap. The B16 you already have is one of the best engines out there to build. Instead of spending 3,000 to put in a different engine, use the 3,000 to build the one you have